I will fly to Malaysia from USA with family in January 2011 and plan to transit either in Guangzhou or Hong Kong for around 10 hours because I want to do a city tour with family. Never been in either city before. Also hoping to buy cheap electronics like the iPad clone or netbook for personal use.

1. Can anyone tell me is it cheaper to find electronics like these in HK or Guangzhou? 2. Where can I go to buy these and how do I get there inexpensively?
3. Does the aiport city tours include shopping places that may have what I'm looking for?
4. Is the price fixed or still negotiable with the sellers?
5. Will I have to pay any tax at airport when I leave?
6. Since I will have about 6 to 8 hours only to do sight seeing with family (wife 2yr old and 4 yr old boys), where should I go if I don't take the airport city tour?

Thank you in advance.